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This command now allows you to specify one of three parameters to indicate which plan or plans you want to remove from cache:

This code works as expected because it uses the GetPostBackEventReference method of the Page object. This method does two things. The first and the most evident is that it returns a string in the format expected by the onchange attribute, as in





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In the CreateEditorParts method, you have to create a List<EditorPart> object to add your custom Editor Parts. You have to specify a unique identifier for each Editor Part B. A good convention is to use the id of the Web Part and append _editorPart. The EditorPart object is added to the list and finally returned from the method. The WebBrowsableObject is used by the Editor Part to get a reference to the Web Part that s being edited. This method needs to return the object itself. The ASP.NET Web Part definition already exposes this interface. Instead of explicitly implementing this interface, you could just override the CreateEditorParts method. I ll show you the explicit method here so you ll see how the interface works. Now your Editor Part is associated with the Web Part. Build and deploy the solution to SharePoint so that you can add the Web Part to a page. When the Web Part





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plan_handle By specifying a plan_handle, you can remove the plan with that handle from cache. (The plan_handle is guaranteed to be unique for all currently existing plans.) sql_handle By specifying a sql_handle, you can remove the plans with that handle from cache. You can have multiple plans for the same SQL text if any of the cache key values are changed, such as SET options. The following code illustrates this:

onchange="__doPostBack( clientsidename , )

USE Northwind2; GO DBCC FREEPROCCACHE; GO SET ANSI_NULLS ON GO SELECT * FROM orders WHERE customerid = 'HANAR'; GO SELECT * FROM Orders WHERE CustomerID = 'CENTC'; GO SET ANSI_NULLS OFF GO SELECT * FROM orders WHERE customerid = 'HANAR'; GO SET ANSI_NULLS ON GO -- Now examine the sys.dm_exec_query_stats view and notice two different rows for the -- query searching for 'HANAR' SELECT execution_count, text, sql_handle, query_plan FROM sys.dm_exec_query_stats CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS TXT CROSS APPLY sys.dm_exec_query_plan(plan_handle)AS PLN; GO

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appears on the page, you can edit its properties. Your custom Editor Part will appear on the right and look like figure 5.6. In figure 5.6, you can also see that the automatically generated interface is still available. To remove the properties from that category, you need to modify the WebBrowsable attribute so that it has the value set to false or remove the attribute from the property. Once that s done, you can once again deploy your project and test the Web Part.

where clientsidename is the client-side ID of the control. (It corresponds to the ClientID property.) In addition to returning this string, the GetPostBackEventReference method remembers that it has been called by a control in the page so that ASP.NET can output the two hidden fields and the JavaScript code of the __doPostBack routine when it sends the page back to the client browser. This method ensures that only one routine and one pair of hidden fields are created, regardless of how many controls on the page have their AutoPostBack property set to True. The GetPostBackEventReference method takes a control reference in its first argument and a string in its second (optional) argument. The second argument is the string stored in the __EVENTARGUMENT field when the postback occurs. For simpler controls, you can leave this argument blank, but sometimes you need this additional argument to fig ure out which operation should be performed on callback. I ll show an example of a custom control that uses this feature in the next section.

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In many cases, controls that expose the AutoPostBack property should also implement the IPostBackEventHandler interface. This interface contains only one method, RaisePostBackEvent, which ASP.NET invokes when the postback actually occurs. There are two main reasons why you should implement this interface:

-- The two rows containing 'HANAR'should have the same value for sql_handle; -- Copy that sql_handle value and paste into the command below: DBCC FREEPROCCACHE(0x02000000CECDF507D9D4D70720F581172A42506136AA80BA); GO -- If you examine sys.dm_exec_query_stats again, you see the rows for this query -- have been removed SELECT execution_count, text, sql_handle, query_plan FROM sys.dm_exec_query_stats CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS TXT CROSS APPLY sys.dm_exec_query_plan(plan_handle)AS PLN; GO

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